Ordered hydroxy-terminated polyether-based urethane compositions



#1 ite I it rates The present invention relates to novel ordered hydroxyterminated polyether-based methane compositions which are especially useful as hydroXy-terminated-urethane components for two-component polyurethane coatings or corresponding single component systems which employ as the other, or diisocyanate ingredient, a blocked isocyanate, and which are also of special utility as bodying agents for urethane coatings, particularly when it is not desired to employ thermoplastic resins for such purpose.

It is an object of the present invention to provide novel bodying agents for urethane coatings. It is a further object to provide novel and valuable ordered hydroxy-terminated urethane components for polyurethane coatings systems. A further object is the provision of such composifions which are poly-ether-based urethanes. Another ob ject is the provision of such ordered urethane compositions which lend advantageous properties to polyurethane coatings in which they are employed as the hydroxyterminated component or ingredient. .Still another object of the invention is the provision of a process for the production of such ordered urethane compositions se-- quentially by the reaction of about one mol of polypropyleneether glycol with about two mols of a selected arylene diisocyanate, and reaction of the thus-produced isocyanate-terminated urethane with about two mols of a selected polyether polyol, and the products thereby produced. Other objects of the invention will become apparent hereinafter.

The foregoing and additional objects are accomplished by the provision of ordered urethane compositions of the following idealized formula:

Q-QINH wherein R is selected from hydrogen and methyl, wherein -OG--O-- is the radical of a polypropyleneether glycol (a) having a molecular weight between about 134 and 1000, wherein T is and T is wherein y is a number from zero to one, inclusive, and wherein Q is the same in both occurrences and is the radical of a branched polyether polyol (b) which is a propylene oxide addition product of a lower alkanol containing at least three and not more than six hydroxy groups per molecule, said urethane composition being prepared sequentially by the reaction of about one molar proportion of polypropylene ether glycol (a) with about two molar proportions of arylene diisocyanate selected from the group consisting of phenylene diisocyanate, tolylene diisocyanate, and diphenylmethane-4,4'- diisocyanate, to produce an isocyanate-terminated polypropyleneether glycol urethane (I), and subsequent reaction of the isocyanate-terminated urethane (I) with 60 resented by the formula:

3,049,515 Patented Aug. 14, 1952 5 ordinary hydroxyl-bearing materials such as polyesters and regular polyols. Polyurethane coatings prepared thereform by reaction with an isocyanate-terminated component dry to touch upon evaporation of solvent, and have considerably less sagging tendency than polyurethane coating formulations incorporating regular polyols.- When the ordered hydroXy-terminated urethane compositions of the present invention are reacted with an isocyanate-terminated component, the resulting polyurethane surface coatings are characterized by properties which are superior to those obtained from the same isocyanate component and previously known polyhydroxy components. The same is true when they are employed as one ingredient of a single component surface coating composition together with a blocked isocyanate as the other ingredient (for example, in baking enamels or wire coatings). This is also true for polyurethane surface coatings prepared from the ordered hydroxy-terminated urethane compositions of the invention as opposed to those prepared from random hydroxy-terminated urethane reaction products, compared to which latter a higher solid content at lower viscosity can be attained in surface coatings embodying the ordered hydroxy-terminated urethane compositions of the invention.

The ordered hydroxy-terminated urethane compositions of the present invention are prepared by reacting about one molar proportion of extending polypropyleneether glycol (a) of selected molecular weight between about 134 and 1000 and about two molar proportions of an appropriate arylene diisocyanate (0), selected from phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6- tolylene diisocyanate, including mixtures of 2,4-and 2,6- tolylene diisocyanates, and diphenylmethane-4,4'-diisocyanate, to produce a diisocyanate-terminated urethane having a tree NCO group at each end of the molecule. If desired, about one molar proportion of one diisocyanate NEG-Q and about one molar proportion of another diisocyanate may be used. One molar proportion of this isocyanateterminated urethane adduct is then reacted with about two molar proportions of the selected polyether polyol (b) to produce an ordered hydroxy-terminated urethane composition in which the terminal hydroxy groups are furnished by the polyether polyol molecule.

The polyether polyol (b) used in the final stage of the sequential reaction is a propylene oxide addition product of a lower alkanol, containing up to and including ten carbon atoms and containing at least three and not more than six hydroxy groups per molecule, and may be repwherein R' with attached oxygen atoms represents a lower when z=2, at least three ns are at least one; and when z=3, at least four ns are at least one. It will be understood that x, z and n may be the same or different in each occurrence. Representative polyether polyols encompassed by this formula include the addition products of glycerine, hexanetriol, and trimethylolpropane with from one to nine mols of propylene oxide, the addition products of such polyols further reacted with one mol of ethylene oxide, the addition product of pentaerythritol with from two to twelve mols of propylene oxide, the addition products of such polyols further reacted with one mol of ethylene oxide, the addition products of dipentaerythritol and sorbitol with from four to eighteen mols of propylene oxide, the addition products of such polyols further reacted with one mol of ethylene oxide, and the like. The terminal ethylene oxide unit, when added to the polyoxypropylene chain or unit, provides a primary hydroxy group of relatively high reactivity for definite direction and precedence of reaction with NCO groups in preparing the final OH-terminated urethane from the intermediate NCO-terminated urethane.

In practice, the molecular weights of the ordered hydroxy-terminated urethane compositions of the invention, prepared in this sequential manner, have been found to be very close to the molecular weight of a composition having an idealized structure, since very little polymerization occurs using predetermined molar proportions and the sequential addition under moderate reaction conditions, viz., exclusion of moisture and initial reaction temperature not exceeding about 60 C. Also, in practice, a chain length of not greater than about 750, and prefera'bly about 400, molecular weight has been found most advantageous for the starting polypropyleneether glycol, and a polyol having no more than an average of about two propylene oxide units added per individual chain of starting polyol is usually preferred. When the polyol (b) employed has four hydroxy groups, the polyether glycol (a) preferably has a molecular weight greater than 400. As for the isocyanate employed, tolylene diisocyanate, usually a mixture of about 80% 20% of the 2,4 and 2,6 isomers, is preferred for reasons of economy. Other variations in the starting materials to procure variations in 'the substituents of the ordered hydroxy-terminated urethane compositions may be usefully made to obtain polyurethane surface coatings of varying types and characteristics upon reaction with a selected diisocyanate component. For example, lengthening of the polyoxypropylene chains shown in the above formulae results in a polyurethane coating having a longer pot life, greater flexibility, and lower solvent resistance, while shortening of these polyoxypropylene chains has just the oposite effect. Flexibility of such coatings can, for example, be readily adjusted by changing the length of the polyoxypropylene chain or chains, either in the starting polypropyleneether glycol (a) or in the polyether polyol (b), or both if desired, and in general employment of products of the invention introduce a trend toward flexibility in coating compositions embodying same. The preferred equivalent weight of the hydroxy-terminated urethanes of the present invention is between about 200 and 400.

The following examples are given to illustrate the present invention but are not to be construed as limiting.

GENERAL PROCEDURE Hydroxy-terminatedurethanes, such as OH-2 of Example 1, are prepared in two stages. The adduct of polypropyleneether glycol and the selected diisocyanate is prepared in the first stage at a ratio of NCO/ OH of about 2/1 and contains two free NCO groups. In the second stage, two molar proportions of polyether triol or tetraol are added to one molar proportion of the adduct in order to form a hydroxy-terminated intermediate with free OH groups on both ends of the molecule. The addition of two polyether triol molecules to the adduct changes the NCO/ OH ratio to 1/2.0; two polyether tetraols to l/2.5; two polyether pentols to 1/ 3.0; and two polyether hexols 'to 1/3'.5. Dilution of the NCO-terminated intermediate at'the end of stage 1 may be with any suitable non-reactive surface surface coating solvent. Many such solvents suitable in general for urethane coatings and components 7 thereof are known in the art, for example, toluene, xylene,

ethyl acetate, butyl acetate, amyl acetate, other similar esters, 2-ethoxyethyl-, 2-methoxyethylor 2-butyoxyethyl acetate, dioxane, ketones, chlorinated solvents, nitro-aliphatic solvents, and the like. In some instances no solvent is required during any stage of the reaction.

Polyether polyols used in the reaction are preferably 10 stripped of water by azeotropic distillation with toluene. In this manner, the amount of Water can be decreased from 0.08-0.15 to 0.02% or even less. A clean, dry, three-necked five-liter flask was used as a reaction vessel, and a nitrogen blanket was maintained over the reactants.

Example 1 (OH-2) Reactants Mols Parts Weight, Percent Polypropyleneether glycol Pluracol P410 (M.W. 420) 2 s40 21. 1 Tolylene diisoeyanate, TDI; 80/20; 2,4/2,6 4 696 17. 5 Polyoxypropylene derivative of trimethylolpropaue-Pluracol TP-440 (M.W.

Z-ethoxyethyl acetate or Z-butox thylacetate 398 10. O Xylene 398 10.0

Norn.Ratio of reactivegroups: N CO/OH=4/8=1/2.

3O PROCEDURE Stage 1: Add to the S-liter reaction vessel-- 7 Parts TDI 696 Polypropyleneether glycol, Pluracol 'P-140 (M.W. 420) 840 By gradual addition of polypropyleneether glycol, Pluracol 1 -410, the temperature of the exothermic reaction is maintained below 60 C. If necessary, cooling is applied. 'Ihe reactants are stirred for 2 hours at 60 C.

and then diluted with:

Parts 2-ethoxyethyl acetate 177 Xylene 177 Stage 2: Parts Add to the prepared adduct polyoxypropylene derivative of trimethylolpropane-Pluracol 'IP-440 (M.W. 411) 1644 Increase the temperature to 80 C. and stir the reactants for 3 hours. Measure the viscosity after each hour with the Gardner Bubble Viscosimeter. When the viscosity rises over Z dilute the content of the vessel to 80% solids with:

7 Parts 2-ethoxyethyl acetate 221 Xylene 221 Pour the resulting OH-2 solution into a clean, dry bottle and cap it tightly in order to exclude moisture.

Properties of 01-1-2:

NCO/OH 1/2 Average molecular weight 1590 Average equivalent weight 398 Hydroxyl number 14-1 Percent hydroxyl 4.27 Properties of 01-1-2 solution:

Non-volatile, percent 80 Weight per gallon, lb. 8.84 Viscosity at 25 C., cps. 12,000-15,000

OH-2 IN URETHANE COATINGS Two typical urethane coating formulations are presented with hydroxy-terminated intermediate OH-2 as the second component. A

TWO COMPONENT URETHANE COATINGS Formulation Composition lsocyf angte-terminated intermediate 2 N (30-1 8 N C 08% or s Hydroxyl-terminated intcrmediate- OH-2 OH-Z Parts 100 10 NCO/H 1. 2/1 1. 2/1

6 Properties .of OH-ZA:

NCO/0H 1/2.5 Average molecular weight 1272 Average equivalent weight 212 Hydroxyl number 265 Percent hydroxyl 8.17 Properties of OH-2A solution:

Non-volatile, percent 60 Weight per gallon, lb. 8.95 Viscosity at C.,'cps. 5000-8000 OH-2A IN URETHANE COATINGS Formulation Composition Isocyanate-terminated intermediate U-1688-1 =U-1ess-2 Pa 90 150 011-2. OH-2A 100 100 2 1 2/1 Formulation Properties Curing time:

Dust free, hr l. 2 1. 4 Dry to touch, hr 3.0 4. 2 Pot life, hr 56 64 Sward hardness 40-52 12-38 Elongation, percent 40-70 200-360 Tensile strength, p.s. 3, 600-5, 000 1, 600-4, 000 Impact test-Gard11er, in

ct 30 30 30 46 60 Solvent resistance, hr.:

Tnlnene 4 4 2-Ethoxyethyl acetate 4 2 Methyl isohutyl ketone 3 2 Water resistance:

Immersion 24 hr., 25 C- Immersion 96 hr., 100 C; Weatherometer (Twin Arc) test, 500 hr.

1 Excellent. 2 No effect. 3 No loss of gloss.

Example 2 (OH-2A) Reactants Mols Parts Weight, Percent Polypropyleneether glycol-Piuracol P- 410 (M.W. 42 2 840 19. 8 Tolylene diisocyanate, T131, 80/20; 24/26 4 696 16. 4 Polyoxypropylene derivative of pentaerythritol-PE P-252l (M.W. 252) 4 1,008 23. 8 2-ethoxyethyl acetate 848 20. 0 Xy n 848 20.0

Nora-Ratio of reactive groups: NCO/OH=4/10=1/2.5.

PROCEDURE 696 parts of TDI are reacted with 840 parts of polypropyleneether glycol, Pluracol P-410, in a 5liter reactor at a temperature not .over 60 C. for at least 2 hours.

. The contents of the reactor are diluted with 142 parts of Z-ethoxyethyl acetate and 142 parts of xylene. In this first stage, an adduct with free NCO groups is produced.

'In the second stage the preparation, 1008 parts of polyoxypropylene derivative of pentaerythritol, PE P-252T, are dispersed in 706 parts of 2-ethoxyethyl acetate and added at once to the adduct. The temperature is raised to 70 C. and the reactants heated for 2 hours. The contents are then diluted with 706 parts of xylene and heated for one additional hour. The viscosity is measnred periodically; when it comes to a stillstand the product is bottled and capped tightly.

U1 6881 consists of 1 mol of P3680? polyoxypropylene der1vat1ve 0f pentaerythritol (M.W. 368) and four mols of tolylene diisocyanate.

U1 6882 consists of 2 mols of P3681 polyoxypropylene derivative of pentaerythritol (M.W. 368), eight mols of tolylene dusocyanate, and one mol of polypropyleneether glycol glilliaifl P-lO. (2 mols of U-168S-1 reacted with one of Formulation Properties Toluene 4 4 Methyl isobutyl ketone 4 3 Example 3 (OH-2B) Reactants Moles Parts Weight, percent Polypropyleneether glycol P-4i0 (M.W.

ylolpropane (TMP 3 mols of propylene oxide)-TP-116 (M.W. 308) 5 1, 540 31. 2 2-Ethoxyethy1 acetate 740 15.0 Xylene 740 15.0

N0'rn.NCO/OH ratio:10/20=1/2. PROCEDURE 870 parts of TDI are reacted in a 5-liter vessel with 1050 parts of polypropyleneether glycol P-410 at a temperature not over 60 C. for at least 2 hours. The contents are diluted with 200 parts 2-ethoxyethyl acetate and 200 parts xylene. In this stage, the adduct with two free NCO groups is formed.

In the second stage this adduct is. combined with two mols 0f polyoxypropylene derivative of trimethylolpropane T P-1l6. 1540 parts of polyol TP-116 are added in one portion with the solvents: 540 parts of Z-ethoxyethyl acetate and 540 parts xylene. The reactants are stirred at 70 C. for 3 hours.

Properties of OH-2B:

Average molecular weight 1384 Average equivalent weight 346 Hydroxyl number 163 Percent hydroxyl 4.92

Properties of OH-2B solution:

Non-volatile, percent 70 Weight per gallon, lb. 9.00

Viscosity at 25 c., cps. 2s,ooo-3o,0oo

OH-2B IN URETHANE COATINGS Formulation Composition Isocyanate-terminated intermediate NCO-1 NC -1 Pa s r 140 232 Hydroxyl-terminated intermediate. 011-218 011-213 Parts 10 100 NCO/OH 1.2/1.0 2.0/1.0

Properties Curing time:

Dust tree, hr 1.0 1. 2 Dry to touch, hr 2. 2. 1 Pot life, hr 24 28 Sward hardness 40-56 48-64 Elongation, percent 40-00 20-40 Tensile strength 4,0006,000 5,0007,00 Impact test-Gardner:

Direct, in.-lbs 16-20 12-16 Indirect, in.-1bs 4-6 2-4 Abrasion resistance, In ./1,000 cycles 50 40 Solvent resistance:

Tnlnenp 4 4 2-Eth0xyethyl acetate 4 4 Methyl isobutyl ketone 3 4 Chemical resistance and water immersion resistance are excellent. The OH-ZB .of Example 3 gives a faster curing and a harder, more solvent resistant coating than the 01-1-2 of Example 1.

Example 4 (OH-2X) 0H-2X IN URETHANETSURFACE comma.

When employed as the. second component together with NCO-lfor N CO-12in the"I l( 2O(Q I-I proportions of Example-1, OH-2X gives hard urethane films which are more flexible but which have slightly less solvent resistance than the films .of Example 1. -Chemical resistance and Water immersion resistance are excellent.

' Example 5 (OH-ZY) Reactants Mols Parts 1' V Polypropyleneether glycol, M.W. 420 1 420 Diphenylmethane-4,4-diisocyanate 2 V 496 Addition product of 4 mols of propylene oxide to one mol of pentaerythritol (P368-TM.W. 368) 2 736 Z-ethoxyethyl acetate 7 I 550 Xylene 5 50 Procedure: Same as in Examples 1-3. 7

Properties: 7 V

Noo/oH r r 1/2.5 Av rag 9 91 m?" Weight 1656 Average equivalent weight 276 Hydroxyl number, 203

r icenthydroxy1' 6.16 ole-2r IN \URETHZANE sURF cE'coATmq's' Wh'en employed as the second component together with NCO-1 or NCO-3 in the NCO/OH'proportions of Example 1, OH-ZY gives urethane films which. are less flexible but which have greater film hardness than the films of Example 1. Chemical resistance and Water immersion resistance are excellent.

Example 6 (OH-ZZ) OH-2Z IN UREIlEl'ANEl SURFACE COATINGS When employed as the second component together with NCO-l or NCO-3 in the NCO/OH proportions of Example 1, 01-1-22 gives urethane films which are less flexible but which have slightly greater solventresistance than the films of Exampleflg Chemical resistance andwater immersion resistance are good. r

Example-7-(QH-2-P) Reataxits V Mols Parts Dipropylene glycol.-. 1 V 134 TDI (/20; 2,4/2,6) '2 348 Addition product of 12 in re mol of pentaerythritol (M.W. 840) 2 1, 680

2-etl10xyetl1yl ace ate 285 Xylene 285 Procedure: Same as in Examples 1-3.

Properties:

NCO/OH 1/ 2.5

Average molecular weight 2160 OH-ZP IN URETHANE SURFACE, oArrNosample 1, OH-2P give urethane films which are more flexible but which have slightly less solvent resistance than the films of Example}. Chemical resistance and water immersion resistance are excellent.

Example 8 (OH-2D) Reactants Mols Parts Polypropyleneether glycol, M.W. 750 1 750 TDI 2 V 348 Addition product of one mol of ethylene oxide to dipropyleneoxide adduct of glycerine (M.W. 249) 2 498 2ethoxyethyl acetate 342 Xylene V l 342 Procedure: Same as in Examples 1-3 7 Properties: V I

NCO/OH 1/2.0 Averagemolec'ular weight 1596 Average equivalent weight w 399 Hydroxyl number 141 Percent hydroxyl 4.27

on-zn m suRrAcn oon'rnics When employed as the second component together with NCO-1 or NCO-Sin the NCO/OH proportions of Example 1, OH-ZDgiVe urethane films which'are more flex- 9 ible but which have less solvent resistance than the films of Example 1. Chemical resistance and water immersion resistance are good.

Example 9 (OH-2Q) 19 flexible but which have greater solvent resistance than the films of Example 1. Chemical resistance and water immersion resistance are excellent.

Example 12 (OH-2N) ample l, OH-2M gives urethane films which are less then one mol of ethylene oxide to one mol of hexalene oxide units and one ethyleneom'de unit (M.W. netriol (M.W. 300). 2 600 292 2 584 2-eth0ryethy1acetqto 257 2-ethoxyethyl aceta te 646 Xylene 257 Xylene V 646 Procedure: Same as in Examples l-3. 15 Procedure: Same as in Examples 1-3. Properties: P

ro erties. NCO/OH 1/20 pNCO/OH U25 Average molecular Weight 1224 Average molecular weight 1944 Av r equwelem welght 306 Average equivalent Weight 324 Hydroxyl number 183 Hydroxyl number 173 P r n hy r xyl Percent hydroxyl 524 e IN URETHANE SURFACE COATINGS OBI-2N IN URETHANE SURFACE COATINGS When employed as the second component together with Wh en employed as the second component together wlth Nco'l the NCO/OH F 0f NCO-1 or NCO-3 in the NCO/OH proportions of Example l, OH-ZQ give urethane films which are less flexible a m p1 e 1 OH 2N gives urethane films which are more but which have greater solvent resistance than the films of flexible but which have greater film hardness than the Example 1. Chemical resistance and Water immersion films of Example L Chemical resistance and Water resistance are excellent mersion resistance are excellent.

EmmPe (OH-2L) Example 13 (OH-ZNX) Beactants Mols Parts Reactants Mols Parts Polypropyleneether glycol, M.W. 420 1 420 TDIWWA/ZIQ 2 348 iiii iileli i ilfi fiiii :ELYLEEIIII:3:3: 5 32% Addition product of 4 mols of propylene oxlde to one 2 720 Addition product of 4 mols of propylene om'de to one gfi g lgfii fi- 360) 319 mol of hexanetriol (M.W. 350) 2 700 Xylene 319 2XSEIIIEYBWY1 9mm") Procedure: Same as in Examples 1-3. 40 Procedure: Same as in Examples Properties: Pro erties' NCO/OH NCOiOH 1/2.0 Average moiecular welfgm 1532 Average molecular weight 1516 Average eqmv'fflent Welght Average equivalent weight 379 Hydroxyl number I-lydroxyl number 148 Percent Percent 4 5 OH'ZL IN URETHANE SURFACE COATINGS OH-2NX IN URETHANE SURFACE COATINGS When employed as the second component together With when em 10 yed as the second com onent to ether with N004 the NCO/OH f NCO-1 or 1 100-3 in the NCo/oH proporti ns of Example OH'ZL f films which are slightly ample 1, OH-ZNX gives urethane films which are less i flexlble but whlch have Shghfly greater solYent reflexible but which have greater solvent resistance than slstance than the films Example Chemlcal the films of Example 1. Chemical resistance and Water sistance and water immersion resistance are good. immersion resistance are excellent.

Example 11 (OH'ZM) Example 14 (OH-2EX) Bantams M015 Parts Reactants Mols Parts g\% %?g g gf MW' 420 Polypropyleneether glycol, P-410 (M.W. 420). 1 420 Addition pioduotof 113161"; 815565512111? Billie EH61 (W20; 4/2, 6) 2 348 mol of trimethylolpropane (M.W. 360). 2 720 fgf gl gigi fi &f gg g to one 2 2500 ggi acemm 2-ethoxyethyl acetate n 1091 Y Xylene 1091 procedlfrez Same as m Examples 65 Procedure: Same as in Examples 1-3. ii ion 1/2 0 ProPerfies' Average molecularweight 152 8 NCO/ OH 7 1/3-5 Average equivalent Weight 382 gverage molecular we1 ght 3400 Hydroxyl number 122 H g l ij Welght 340 Percent hydroxyl 3.7 y roxy er 165 Percent hydroxyl e 5.0 OH-2M IN URETHANE SURFACE COATINGS When employed as the secondcomponent together with OH'2EX IN URETHANE SURFACE COATING$ NCO-1 or NCO-3 in the NCO/OH proportions of EX- 7 When employed as the second component together With NCO-1 or NCO-3 in the NCO/OH proportions of Ex- 11 ample 1, OH-ZEX gives urethane films which are slightly more flexible but which have slightly less solvent resistance than the films o.Example 1. Chemical resistance and water immersion resistance are excellent.

o'H-2ET IN URETHANE SURFACE COATINGS When employed as the second component together with NCO-l or NCO-3 in the NCO/ OH proportions of Exampie 1, OH-ZET gives urethane films which are less flexible but which have slightly greater solvent resistance than the films of Example 1. Chemical resistance and water immersion resistance are excellent. V 7 g I It is to be understood that the invention is not limited to the exact details of operation or exact compounds shown and described, as obvious modifications and equivalents will be apparent to one skilled in the art, and the invention is therefore to be limited only by thescope of the appended claims.

I claim:

1. An orderedhydroxy-terminated urethane composition prepared sequentially by firstmixing and reacting together about one molar proportion of'pdlypropyleneether glycol (a) having a molecular weight between about 134 and 1000, with about two molar proportions of arylene diisocyanate (c) selected from the group consisting of phenylenediisocyanate, tolylene diisocyanate, and diphenylmethane-4,4'-diisocyanate, to produce an isocyanate-terminated polypropyleneether glycol urethane, and then mixing and reacting about one molar proportion of the thus-formed isocyanate-terminated urethane with. abouttwo molar proportions of polyether polyol (b) have the formula: a

wherein R with attached oxygen atoms represents a polyhydric lower-aliphatic alcohol radical; x is a number from zero to one; z is a number from zero to three; and n is a number from zero to three, provided that when z=0, atleast one n is at least one; when z: 1, at least two ns are at least one; when z=2, at least three ns are at least one; and when z=3, at least four ns are at least one; to

produce the desired order hydroxy-terminated urethane 6 composition, the initial reaction temperature in the first step "of the reaction being not greater than about sixty degrees centigrade. a a 7 2. An ordered hydroxy-terminated urethane composition according to claim 1 wherein the polypropyleneether glycol (a) has a molecular weight not greater thanabout 12 tion according to claim 2 wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyether polyol (b) is a pentaerythritol alkylene oxide addition product.

5. An ordered hydroxy-terminated urethane composition according to claim 2 wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyetherpolyol (b) is a hexanetriol alkylene oxide addition product.

6. An ordered hydroxy-terminated urethane composition according to claim 2-wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyether polyol (b) is a glycerine alkylene oxide addition product.

7. An ordered hydroxy-terminated urethane composition according to claim l wherein the average equivalent weight is between about 200 and about 400.

8. A solution of an ordered hydroxy-terminated urethane composition according to claim 1 in a surface coating solvent which is non-reactive therewith.

9. A urethane coating composition including as one component an ordered'hydroxy-terminated urethane composition according to claim 1 and including an organic polyisocyanate as a second component.

10. A coating composition according to claim 9 including an organic surface coating solvent which is nonreactive with both the components of the coating composition and their polyurethane reaction product.

11. A process for producing an ordered hydroxy-teru minated urethane composition according to claim 18, wherein the polypropyleneether glycol (a) has a molecular weight not greater than about 750, 11 does not exceed an average of two, and n has a value of at least one in each occurrence.

12. A process for producing an ordered hydroxy-terminated urethane composition according to claim 11, wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyether polyol (b) is an alkylene oxide addition product of trimethylolpropane.

13. A process for producing'an orderedhydroxy-terminated urethane composition according to claim 11, wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyether polyol (b) is a pentaerythritol alkylene oxide addition product.

14. A process for producing an ordered hydroxy-terminated urethane composition according to claim 11, wherein the arylene'diisocyanate '(c) is tolylene diisocyanate and the polyether polyol (b) is a hexanetriol alkylene oxide addition product.

15. A process for producing an ordered hydroxy-terminated urethane composition according to claim 11, wherein the arylene diisocyanate (c) is tolylene diisocyanate and the polyether polyol (b) is a glycerine alkylene oxide addition product.

16. A novel ordered hydroxy-terminated polyetherbased urethane composition produced by mixing and reacting together about one molar proportion of a polypropyleneether glycol (a), having a molecular weight between about 134 and 1000, and about two molar proportions of an arylene diisocyanate (c) selected from the group consisting of tolylene diisocyanate, phenylene diisocyanate, and' diphenylmethane-4,4-diisocyanate, to produce a polyether-based isocyanate-terminated urethane intermediate adduct, and then mixing and reacting together about one molar proportion of the thus-produced adduct with about two molar proportionsof a polyol (b) which is a propylene oxide addition product of a polyhydric lower-aliphatic alcohol having at least three and notmore than six hydroxy groups in the molecule.

17. A process for the production of a novel ordered hydroxy-terminated polyether-based urethane composition, which includes the step of mixing and reacting together about one molar proportion of a polypropyleneether glycol (a), having a molecular weight between about 134 and 1000, and about two molar proportions of an arylene diisocyanate (0) selected from the group consisting of tolylene diisocyanate, phenylene diisocyanate, and

13 diphenylmethane-4,4-diisocyanate, to produce a polyetherbased isocyanate-terminated urethane intermediate adduct, and then mixing and reacting together about one molar proportion of the thus-produced adduct with about two molar proportions of a polyol (b) which is a propylene oxide addition product of a polyhydric lower-aliphatic alcohol having at least three and not more than six hydroxy groups in the molecule.

18. A process for the sequential production of an ordered hydroxy-terminated urethane composition which includes the steps of first mixing and reacting together about one molar proportion of a polypropyleneether glycol (a) having a molecular weight between about 134 and 1000 with about two molar proportions of arylene diisocyanate (c) selected from the group consisting of phenylene diisocyanate, tolylene diisocyanate, and diphenylmethane-4,4-diisocyanate, to produce an isocyanate-terminated polypropyleneether glycol urethane and then mixing and reacting about one molar proportion of the thus-produced isocyanate-terminated urethane with about two molar proportions of polyether polyol (b) having the formula:

wherein R with attached oxygen atoms represents the radical of a polyhydric lower-aliphatic alcohol; x is a number from zero to one; z is a number from zero to three; and n is a number from zero to three, provided that when z=0, at least one n is at least one; when z= 1, at least two ns are at least one; when z=2, at least three ns are at least one; and when z=3, at least four ns are at least one; to produce the desired ordered hydroxyterminated urethane composition, the initial reaction temperature in the first step of the reaction being not greater than about sixty degrees Centigrade.

References Cited in the file of this patent UNITED STATES PATENTS 2,814,605 Stilmar Nov. 26, 1957 2,866,774 Price Dec. 30, 1958 2,871,226 McShane Jan. 27, 1959 2,897,181 Wendemuth July 28, 1959 FOREIGN PATENTS 206,295 Australia Feb. 10, 1955 205,456 Australia Jan. 4, 1957 769,091 Great Britain Feb. 27, 1957 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 O49 516 August 14, 1962 Adolfas Damusis It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 1, line 24, for "polyetherbased" read polyether-based column 3, line 25, after "addition" insert procedure column 4, line 35. for "P-llO" read P-41O column ll, after the table in Example 15, insert Procedure: Same as in Examples 1-3. line 6O for "order" read ordered Signed and sealed this 16th day of April 1963.,

(SEAL) Attest:

ERNEST w. SWIDER DAVID L. LADD A i g Officer Commissioner of Patents 

1. AN ORDERED HYDROXY-TERMINATED URETHANE COMPOSITION PREPARED SEQUENTIALLY BY FIRST MIXING AND REACTION TOGETHER ABOUT ONE MOLAR PROPORTION OF POLYPROPYLENEETHER GLYCOL (A) HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 134 AND 1000, WITH ABOUT TWO MOLAR PROPORTIONS OF ARYLENE DIISOCYANATE (C) SELECTED FROM THE GROUP CONSISTING OF PHENYLATE DIISOCYANATE, TOLYLENE DIISOCYANATE, AND DIPHENYLEMETHANE-4,4''-DIIOCYANATE, TO PRODUCE AN ISOCYANATE-TERMINATED POLYPROPYLENEETHER GLYCOL URETHANE, AND THEN MIXING AND REACTING ABOUT ONE MOLAR PROPORTION OF THE THUS-FORMED ISOCYANATE-TERMINATED URETHANE WITH ABOUT TWO MOLAR PROPORTIONS OF POLYETHER POLYOL (B) HAVE THE FORMULA: 